import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		byte[] primeiroArray = "stack".getBytes();
		byte[] segundoArray  = "overflow".getBytes();
		ByteArrayOutputStream terceiroArray = new ByteArrayOutputStream();
 
		terceiroArray.write(primeiroArray);
		terceiroArray.write(segundoArray);
 
		System.out.println(Arrays.toString(terceiroArray.toByteArray()));
		System.out.println(terceiroArray.toString());
	}
}

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